JP4638754B2 - Optical device and optical cross-connect device - Google Patents

Optical device and optical cross-connect device Download PDF

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JP4638754B2
JP4638754B2 JP2005080154A JP2005080154A JP4638754B2 JP 4638754 B2 JP4638754 B2 JP 4638754B2 JP 2005080154 A JP2005080154 A JP 2005080154A JP 2005080154 A JP2005080154 A JP 2005080154A JP 4638754 B2 JP4638754 B2 JP 4638754B2
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JP2006262365A (en
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泰彦 青木
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富士通株式会社
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0201Add-and-drop multiplexing
    • H04J14/0202Arrangements therefor
    • H04J14/021Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/0212Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0201Add-and-drop multiplexing
    • H04J14/0215Architecture aspects
    • H04J14/0217Multi-degree architectures, e.g. having a connection degree greater than two
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0287Protection in WDM systems
    • H04J14/0297Optical equipment protection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0201Add-and-drop multiplexing
    • H04J14/0202Arrangements therefor
    • H04J14/021Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254Optical medium access
    • H04J14/0267Optical signaling or routing
    • H04J14/0269Optical signaling or routing using tables for routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0287Protection in WDM systems
    • H04J14/0289Optical multiplex section protection
    • H04J14/029Dedicated protection at the optical multiplex section (1+1)
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0287Protection in WDM systems
    • H04J14/0289Optical multiplex section protection
    • H04J14/0291Shared protection at the optical multiplex section (1:1, n:m)
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0287Protection in WDM systems
    • H04J14/0293Optical channel protection
    • H04J14/0294Dedicated protection at the optical channel (1+1)
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0287Protection in WDM systems
    • H04J14/0293Optical channel protection
    • H04J14/0295Shared protection at the optical channel (1:1, n:m)
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0016Construction using wavelength multiplexing or demultiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0024Construction using space switching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0037Operation
    • H04Q2011/0039Electrical control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0037Operation
    • H04Q2011/0043Fault tolerance
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0079Operation or maintenance aspects
    • H04Q2011/0081Fault tolerance; Redundancy; Recovery; Reconfigurability

Description

  The present invention relates to an optical device and an optical cross-connect device.

  In optical communication systems, currently, transmission capacity is increased by using wavelength division multiplexing (WDM). In addition, commercialization of optical cross-connect nodes and optical add / drop nodes that perform switching using the optical wavelength as a switching unit at a hub node or an add / drop node in a ring network where transmission line fibers are aggregated in a communication system has been promoted. Yes.

Conventionally, as shown in FIG. 18, for example, individual components such as a wavelength demultiplexer 901, an optical switch 902, an optical variable attenuator 903, and a wavelength multiplexer 904 are individually mounted in each unit in these devices. It was a form. The apparatus described in Patent Document 1 is an example in which individual components are mounted as independent units as described above.
At present, in order to reduce the size of the apparatus, introduction of a wavelength selective optical switch (WSS: Wavelength Selective Switch) in which the above functions are integrated is also in progress. FIG. 19 shows an optical cross-connect device 910 as an example configured by using the wavelength selective switch as described above. The optical cross-connect device 910 shown in FIG. 19 outputs one of n output ports in units of wavelengths for WDM input light input from each of the n input ports # 11 to # 1n. It can be switched as a path and output as WDM output light through output ports # 21 to # 2n.

  As the optical cross-connect device 910, a number of wavelength selective switches (1 × n wavelength selective switches) 911 to 91n corresponding to the number of input ports are provided on the input port side and n on the output port side. × 1 Wavelength selective switches 921 to 92n are provided in a number corresponding to the number of output ports, and the outputs of the wavelength selective switches 911 to 91n are configured to be connected to the inputs of the wavelength selective switches 921 to 92n one by one. Yes.

In the optical cross-connect device 910 as shown in FIG. 19, when a failure occurs in an individual component or the like in each of the wavelength selective switches 911 to 91n and 921 to 92n, the components other than the component in which the failure has occurred operate normally. Even if this is done, it is necessary to exchange the wavelength selective switches 911 to 91n and 921 to 92n.
In particular, as illustrated in FIG. 20, in the wavelength selective switches 911 to 91n and 921 to 92n, an optical signal having a specific wavelength of WDM light [for example, light having a wavelength λ1 of WDM optical signals having wavelengths λ1 to λ8. If only the switch operation for the signal, see (a)] or only the switch operation to a specific output path fails [see (b)], other wavelengths or other output methods Even if the switching on the road was operating normally, it was necessary to replace the wavelength selective switch constituting one unit.

Accordingly, in the cross-connect device 910 as shown in FIG. 19, a configuration that restores the failure without waiting for the unit replacement when the failure occurs as described above is required as a problem, and such a unit is replaced. In doing so, it is required as an issue to minimize the influence on other normally operating connections.
JP 2001-16625 A

The present invention has been made in view of such problems, and an object thereof is to realize a redundant configuration while reducing the size of the apparatus.
It is another object of the present invention to enable switching to a standby system in wavelength units for wavelength multiplexed signals handled by a wavelength selective switch.
It is another object of the present invention to eliminate the influence on other normally operating connections when exchanging the wavelength selective switch.

  Alternatively, it is intended to enable in-service failure recovery.

For this reason, the optical device of the present invention corresponds to a plurality of input ports, a plurality of output ports, a plurality of upstream optical elements provided corresponding to the plurality of input ports, and the plurality of output ports. A plurality of downstream optical elements, and each of the plurality of upstream optical elements is connected to the input port corresponding to an input and a plurality of outputs to the plurality of downstream optical elements. Each of the plurality of downstream optical elements is connected to the output port to which the output of the plurality of upstream optical elements is input, and the output is corresponding to the wavelength multiplexed light from the plurality of input ports. For the signal , the plurality of upstream optical elements and the plurality of downstream optical elements are configured such that the plurality of output ports serving as output destinations can be switched for each wavelength, and a plurality of inputs are connected to the plurality of input ports. Each connected to the plurality of An upstream pre-switch is switchable to the output of the wavelength-multiplexed optical signal from the force for each wavelength, the input connected to the output of the upstream-side preliminary switch, a plurality of outputs connected to each of the plurality of output ports A downstream standby switch capable of outputting an optical signal from the input to the plurality of outputs for each wavelength, and branching the wavelength-multiplexed optical signal input from the input port into two; In accordance with the number of input ports, a plurality of input port side optical couplers are provided to output to the upstream optical element corresponding to the other, and the other to the upstream standby switch, and the output wavelength output from the downstream optical element A plurality of output port side optical couplers for combining and outputting the multiplexed optical signal and the optical signal from the downstream standby switch are provided according to the number of output ports.

In the above-described optical device, a failure occurs in the connection of the first upstream optical element, which is one of the upstream optical elements, to the first downstream optical element, which is one of the downstream optical elements. The upstream standby switch receives a wavelength input from an input port corresponding to the first upstream optical element and output from the first upstream optical element to the first downstream optical element. of the optical signal output, the downstream side spare switch to an output port corresponding to the downstream side optical device of the first, it is possible to output the input optical signal.

Further, when a failure occurs in the output of the first wavelength of the first upstream optical element, which is one of the upstream optical elements, the upstream standby switch is connected to the first upstream optical element. The optical signal having the first wavelength input from the corresponding input port is output, and the downstream standby switch outputs the downstream light from which the first wavelength is output from the first upstream optical element. The input optical signal can also be output to an output port corresponding to the element.

Further, a path between the input port and the output port for each optical wavelength set by the upstream optical element and the downstream optical element, and a path set by the upstream spare switch and the downstream spare switch It is good also as providing the control part which performs switching control between.
Furthermore, an optical cross-connect device according to the present invention is an optical cross-connect device that performs optical cross-connect between a plurality of input ports and a plurality of output ports, and an input wavelength multiplexed optical signal from the input port for each wavelength. An upstream wavelength selective switch that outputs from the output route switched to is provided corresponding to the input port, and an optical signal output from the output route of each upstream wavelength selective switch is input to the output port. A downstream wavelength selective optical switch that selects an optical signal to be guided for each wavelength and outputs an output wavelength multiplexed optical signal is provided corresponding to the output port, and an input wavelength multiplexed optical signal from the input port is input. The wavelength tunable filter that can transmit the selected wavelength component and the optical signal of the wavelength component that has been transmitted by the wavelength tunable filter are addressed to each output port. Branch branch element, is characterized in that the conduction cut-off gates to conduct or cut off to the respective output ports for the optical signal branched by the branching element is provided respectively according to the number of the input port.

Thus, according to the present invention, the following advantages can be obtained.
(1) By suppressing an increase in the number of wavelength selective switches provided as a standby system, there is an advantage that the apparatus can be downsized and power consumption can be reduced.
(2) When exchanging the wavelength selective switch, there is an advantage that it is possible to eliminate the influence on other normally operating connections and to effectively use the spare wavelength path resource.

  (3) There is also an advantage that failure recovery can be performed in-service (during device operation).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition to the above-described object of the present invention, other technical problems, means for solving the technical problems, and operational effects thereof will become apparent from the disclosure according to the following embodiments.
[A1] Description of First Embodiment [A1-1] Configuration FIG. 1 is a diagram showing an optical cross-connect device (optical device) 1 according to a first embodiment of the present invention. The optical cross-connect device 1 shown in FIG. 1 can perform a cross-connect process on WDM signal light input through input ports # 11 to # 14 and output it through output ports # 21 to # 24. In other words, paths can be arbitrarily set in wavelength units at the input ports # 11 to # 14 and the output ports # 21 to # 24. In other words, a cross-connect node in an optical network can be configured by connecting an optical fiber as a transmission line to the above-described ports # 11 to # 14 and # 21 to # 24.

  Here, the optical cross-connect device 1 includes upstream side wavelength selective switches (upstream side optical elements) 101 to 104 corresponding to the input ports # 11 to # 14, and downstream side wavelength selective optical switches (downstream side light). (Elements) 111 to 114 are provided corresponding to the output ports # 21 to # 24, and spare wavelength selective switches 121 and 122, input port # 11 to # 14 side optical couplers 131 to 134, and output port # 21. The optical couplers 141 to 144 on the # 24 side and an OXC (Optical Cross Connect) controller 150 are provided.

  The upstream side wavelength selective switches 101 to 104 have their inputs connected to the corresponding input ports # 11 to # 14 and their four outputs connected to the four downstream wavelength selective switches 111 to 114, respectively. The upstream wavelength selective switches 101 to 104 are upstream optical switches that output the input WDM optical signals from the input ports # 11 to # 14 from the outputs switched for each wavelength among the four outputs. is there.

That is, the upstream wavelength selective switches 101 to 104 respectively input the wavelength multiplexed optical signals from the input ports # 11 to # 14 to the output route to which any of the downstream wavelength selective optical switches 111 to 114 is connected. It can be switched for each wavelength.
Further, the downstream wavelength selective switches 111 to 114 receive the optical signals output from the output paths of the upstream wavelength selective switches 101 to 104 as input, and optical signals to be guided to the corresponding output ports # 21 to # 24. Is a downstream optical switch that can selectively output as an output wavelength multiplexed optical signal for each wavelength. Thus, the optical signals to be guided to the output ports # 21 to # 24 can be selected and output for each wavelength for the output optical signals from the upstream side wavelength selective switches 101 to 104.

  Accordingly, the upstream side wavelength selective switches 101 to 104 and the downstream side wavelength selective switches 111 to 114 switch the four output ports as output destinations for each wavelength for the light from the four input ports # 11 to # 14. It is configured to be possible. That is, as shown in FIG. 1, when wavelength multiplexed optical signals are input through four input ports # 11 to # 14, output destinations are set to four output ports for each wavelength component of the input wavelength multiplexed optical signal. By switching to any of # 21 to # 24, wavelength multiplexed optical signals can be output from the output ports # 21 to # 24, respectively. In other words, the optical cross-connect device 1 realizes a 4-input 4-output optical cross-connect function.

  The upstream wavelength selective switches 101 to 104 described above receive four wavelength multiplexed optical signals from the input ports # 11 to # 14 as one input and are connected to the downstream wavelength selective switches 111 to 114. A 1 × 4 wavelength selective switch that outputs to any of the routes is configured. Similarly, the downstream side wavelength selective switches 111 to 114 constitute a 4 × 1 wavelength selective switch with 4 inputs and 1 output.

  Further, the spare wavelength selective switch 121 is provided on the input ports # 11 to # 14 side, and the spare wavelength selective switch 122 is provided on the output ports # 21 to # 24 side. The spare wavelength selection switch 121 is an upstream spare switch in which four inputs are connected to each of the plurality of input ports # 11 to # 14, and the output of light from the four inputs can be switched for each wavelength. . The auxiliary wavelength selection switch 122 has an input connected to the output of the upstream auxiliary switch 121, four outputs connected to each of the four output ports # 21 to # 24, and transmits light from the input for each wavelength. This is a downstream side spare switch that can output four outputs.

  As the two wavelength selective switches 121 and 122 cooperate with each other, as will be described later, the optical signal of the wavelength selected in each output route in the upstream wavelength selective switches 101 to 104, and the downstream side A path for an optical cross-connect can be set as a shared standby system for an optical signal having a wavelength selected as an output path by the wavelength selective switches 111 to 114.

  The optical couplers 131 to 134 are provided in accordance with the input ports # 11 to # 14. The optical couplers 131 to 134 respectively branch the wavelength multiplexed optical signals input from the input ports # 11 to # 14 into two branches. The upstream side wavelength selective switches 101 to 104 corresponding to the input ports # 11 to # 14 and the other side are output to the spare input port side wavelength selective switch 121, respectively.

That is, since the backup wavelength selective switch 121 can receive optical signals input through all the input ports # 11 to # 14 through the optical couplers 131 to 134, these input ports # It functions as a backup for the wavelength selection switches 101 to 104 corresponding to (working) 11 to # 14.
Further, the optical couplers 141 to 144 are provided according to the output ports # 21 to # 24, and output wavelength multiplexed optical signals output from the downstream side wavelength selective switches 111 to 114 and spare outputs. The optical signal from the port side wavelength selective switch 122 is multiplexed and output.

In other words, since the output from the wavelength selective switch 121 is input to the standby wavelength selective switch 122, optical signals can be output through all the output ports # 21 to # 24 through the optical couplers 141 to 144. These function as backups for (active) wavelength selective switches 111 to 114 corresponding to these output ports # 21 to # 24.
Further, the OXC controller (control unit) 150 performs overall control of the optical cross-connect by the optical cross-connect device 1, and particularly in the upstream wavelength selective switches 101 to 104 and the downstream wavelength selective switches 111 to 114. Switching control between a path (wavelength path) between input and output fibers for each optical wavelength set through switching and a path for a spare optical cross-connect by the wavelength selective switches 121 and 122 is performed. . The OXC controller 150 includes a wavelength path table 151 and a setting change unit 152, which will be described later.

FIG. 2 is a diagram showing the upstream wavelength selective switches 101 to 104 described above. As shown in FIG. 2, the upstream side wavelength selective switches 101 to 104 include a demultiplexing unit 100a, a switch unit 100b, a multiplexing unit 100c, a tap coupler 100d, an optical switch 100e, a demultiplexing unit 100f, a photo detector 100g, and a control unit. It is configured with 100h.
The demultiplexing unit 100a, the switch unit 100b, and the multiplexing unit 100c have functions similar to those of the wavelength demultiplexer 901, the optical switch 902, and the wavelength multiplexer 904 shown in FIG. 18, respectively. The switch unit 100b and the multiplexing unit 100c selectively switch four output paths for each wavelength component of the WDM signal light input through one input port.

The tap coupler 100d branches the optical signals after wavelength selective switching in the branching unit 100a, the switch unit 100b, and the multiplexing unit 100c, and the optical switch 100e is an optical signal branched by the tap coupler 100d. The signal is selectively switched and output for each output route from which the signal originates.
Further, the demultiplexing unit 100f demultiplexes the optical signal selectively output by the optical switch 100e for each wavelength component. The photodetector 100g detects the level of the optical signal for each wavelength component demultiplexed by the demultiplexing unit 100f.

  Then, the control unit 100h controls the switching function of the above-described switch unit 100b, and outputs it in its own wavelength selective switches 101 to 104 based on the level of the optical signal for each wavelength component detected by the photodetector 100g. An abnormality of the optical signal guided to the route is detected for each wavelength component, and this is output to the OXC controller 150 as an alarm.

  The downstream side wavelength selective switches 111 to 114 have the same configuration as that of the demultiplexing unit 100a, the switch unit 100b, and the multiplexing unit 100c in the upstream side wavelength selective switches 101 to 104 with the input / output relationship reversed. The signal light input through the four input paths can be selectively output to the corresponding output port for each wavelength component.

  The downstream wavelength selective switches 111 to 114 also have a function of detecting an abnormality for each wavelength component with respect to the level of the optical signal to be output to the output port. For this reason, the upstream wavelength selective switch described above is used. A configuration corresponding to the tap coupler 100d, the demultiplexing unit 100f, the photodetector 100g, and the control unit 100h of 101 to 104 is provided, and an abnormality for each wavelength component of the optical signal is output to the OXC controller 150.

  In the wavelength path table 151 of the OXC controller 150, for example, as shown in FIG. 3, the input ports # 11 to # 14 and the output ports # 21 to # 24 for which wavelength paths are to be set for each wavelength forming the wavelength multiplexed optical signal. It memorizes about the relationship. The wavelength path settings in the wavelength selective switches 101 to 104 and 111 to 114 are set and controlled by the OXC controller 150 in accordance with the contents of the wavelength path table 151 described above.

  For example, in the one shown in FIG. 3, for example, among the WDM optical signals input to the input port # 11, the wavelength path is set so that the wavelength λ1 is connected to the output port # 21. In this case, the wavelength selective switch 101 connected to the input port # 11 through the optical coupler 131 is set to output the optical signal having the wavelength λ1 to the wavelength selective switch 111. The optical signal of wavelength λ1 from the selection switch 101 is set to be guided to the output port # 21.

  Further, when the alarm information for each wavelength is input from each of the wavelength selective switches 101 to 104 and 111 to 114, the setting changing unit 152 performs control for changing the setting of the wavelength path based on the setting of the wavelength path table 151. Are output to the wavelength selective switches 101-104, 111-114. In the setting change unit 152, when changing the setting of the wavelength path, the contents of the wavelength path table 151 are also updated as appropriate.

  Specifically, the setting changing unit 152 uses the detection information from the wavelength selective switches 101 to 104 and the contents of the wavelength path table 151 to determine the optical signals selected on the output routes in the wavelength selective switches 101 to 104. Detect anomalies. Similarly, from the detection information from the wavelength selective switches 111 to 114 and the contents of the wavelength path table 151, an abnormality is detected for any wavelength component in the optical signal selected as the output route by the wavelength selective switches 111 to 114. To do.

  When the setting change unit 152 is notified of the abnormality of the optical signal as an alarm from the wavelength selective switches 101 to 104, 111 to 114, the wavelength changing table 152 is referred to, and the wavelength path in which the abnormality has occurred is reserved. The wavelength path setting is changed to switch to the path for the optical cross-connect. Specifically, an abnormality occurs by changing the setting (wavelength path setting) in the standby wavelength selective switches 121 and 122 together with the upstream and downstream wavelength selective switches related to the wavelength path in which the abnormality has occurred. The saved wavelength path is saved to the backup wavelength path.

  Note that the setting changing unit 152 does not switch the other wavelength path between the upstream and downstream wavelength selective switches related to the wavelength path in which the abnormality has occurred to the path for the spare optical cross-connect. Defer to. This eliminates the need to switch the path setting in the wavelength selective switch related to the wavelength path in which the abnormality has occurred, including other normal wavelength paths, and does not affect communication on the normal wavelength path, The wavelength paths that can be set by the standby wavelength selective switches 121 and 122 are efficiently used.

[A1-2] Operational Effect [A1-21] Regarding the change of the wavelength path to the path for the spare optical cross-connect In the optical cross-connect device 1 according to the first embodiment configured as described above, On the device input / output side, the wavelength selection switches 121 and 122 for backup (redundancy) are shared among the wavelength selection switches 101 to 104 and 111 to 114 via the optical couplers 131 to 134 and 141 to 144, respectively. Therefore, as shown in the flowchart of FIG. 4, the input / output paths of the wavelength selective switches 101-104, 111-114 connected to the ports # 11- # 14, # 21- # 24, and the ports # 11- #, respectively. 14, in-service failure recovery is possible for failures of individual wavelengths forming a path between # 21 and # 24.

  For example, in a state where the optical cross-connect device 1 is normally operated without a failure, the optical signals of the wavelength selective switches 101 to 104 and 111 to 114 are set based on the setting in the wavelength path table 151 of the OXC controller 150. Since the path can be switched normally, the cross connection process is performed for each wavelength component on the paths between the input ports # 11 to # 14 and the output ports # 21 to # 24 (step A1). At this time, the standby wavelength selective switches 121 and 122 are not in operation.

  In each of the wavelength selective switches (WSS) 101 to 104 and 111 to 114, when an optical signal abnormality is detected by the optical signal abnormality detection function, an alarm output function outputs the alarm to the OXC controller 150 ( Step A2). When the OXC controller 150 receives an alarm from any one of the wavelength selective switches 101 to 104 and 111 to 114, the path is changed to a spare optical cross-connect path according to the content of the alarm.

  Specifically, when the alarm is due to a failure with respect to the wavelength path, the setting change unit 152 refers to the wavelength path table 151 and disconnects the wavelength path with respect to the failure occurrence wavelength (step A3). For example, in the case where a wavelength path is set between the input port # 11 and the output port # 24 for the optical signals of wavelengths λn−1 and λn according to the contents of the wavelength path table 151 shown in FIG. When a failure has occurred in the wavelength path λn via 114, switching in the wavelength path in which the failure has occurred is stopped.

  That is, when an abnormality such as a failure occurs in the optical signal having the wavelength λn in the wavelength selective switch 101 and switching becomes impossible (see A in FIG. 5), the setting change unit 152 shown in FIG. Recognizing and referring to the wavelength path table 151, switching of the wavelength λn in the wavelength selective switch 114 is stopped, and the wavelength path for the failure occurrence wavelength λn is disconnected (see B in FIG. 6). When a failure occurs in the downstream wavelength selective switch 114, the switching of λn in the upstream wavelength selective switch 101 related to the wavelength path in which the failure has occurred is stopped.

  Even when the alarm is due to a failure in the switching path of the wavelength selective switch, the path to the output destination port of the failure port is disconnected (step A3). For example, in accordance with the contents of the wavelength path table 151 shown in FIG. 3 described above, an abnormality such as a failure occurs in the route connecting the input port # 11 and the output port # 24 via the wavelength selective switches 101 and 114. If the switching becomes impossible, the setting change 152 recognizes this by an alarm, refers to the wavelength path table 151, stops the switching of the wavelengths λn−1 and λn in the wavelength selective switch 114, and fails. The generation path (wavelength path for wavelengths λn−1 and λn) is cut.

  That is, when an abnormality such as a failure occurs in the upstream wavelength selective switch 101 and the path switching to the downstream wavelength selective switch 114 becomes impossible, the light from the wavelength selective switch 101 on the downstream side 114 Switching in (in this case, λn−1, λn) is stopped. When a failure occurs in the downstream wavelength selective switch 114, switching of light (wavelengths λn−1, λn) in the upstream wavelength selective switch 101 associated with the switching path in which the failure has occurred is stopped. .

Next, the setting changing unit 152 changes the settings of the standby wavelength selection switches 121 and 122 in order to restore the path in which the failure has occurred (wavelength path unit or wavelength path unit). Step A4).
As a specific example, a case will be described in which a failure is recovered for the wavelength path λn between the input port # 11 and the output port # 24. In this case, the setting changing unit 152 outputs an instruction to change the wavelength selection switching setting to the wavelength selective switches 121 and 122. In the wavelength selective switch 121, the switch function (see reference numeral 100b in FIG. 2) is set so that the optical signal having the wavelength λn from the input port # 11 input through the optical coupler 131 is output to the wavelength selective switch 122. Be changed. Similarly, in the wavelength selective switch 122, the setting of the switch function is changed so that the optical signal having the wavelength λn from the wavelength selective switch 121 is output to the optical coupler 141.

  As a result, the wavelength path λn between the input port # 11 and the output port # 24 is restored by changing the setting of the wavelength selective switches 121 and 122 (see C in FIG. 6). In this case, the path of the wavelength λn−1 connecting the wavelength selective switch 101 and the wavelength selective switch 114 in which the failure has occurred can be normally communicated. Leave without switching to the route (see D in FIG. 6).

Therefore, even if the wavelength path λn is switched, the wavelength λn-1 which is normal does not affect the communication of the wavelength path and can be set by the standby wavelength selective switches 121 and 122. Efficient use of wavelength path resources.
In other words, when a failure occurs in the output of the first wavelength λn of the wavelength selective switch 101 as the first upstream optical element that is one of the upstream optical elements, the upstream standby switch 121 The light of wavelength λn input from the input port # 11 corresponding to the selection switch 101 is output, and the downstream standby switch 122 outputs an output port corresponding to the wavelength selection switch 114 from which the wavelength λn is output from the wavelength selection switch 101. The input light can be output to # 24.

  In addition, the wavelength selective switch 101 as the first upstream optical element, which is one of the upstream optical elements, is connected to the wavelength selective switch 114 as the first downstream optical element, which is one of the downstream optical elements. When a failure occurs in the connection, the upstream standby switch 121 outputs the light having the wavelength output from the wavelength selective switch 101 to the wavelength selective switch 114, which is input from the input port # 11 corresponding to the wavelength selective switch 101. The downstream standby switch 122 can output the input light to the output port # 24 corresponding to the wavelength selective switch 114.

When the wavelength selective switches 121 and 122 have successfully set the backup route as described above, the function unit (see reference numeral 100h in FIG. 2) as the control unit notifies the OXC controller 150 to that effect.
Then, the setting changing unit 152 of the OXC controller 150 rewrites the contents of the wavelength path table 151 according to the contents of the switched wavelength path, for example, as shown in FIG. 7 (step A5). In FIG. 7, “extended port # 24” indicates that connection is established with a path conducting to output port # 24 through auxiliary wavelength selective switches 121 and 122.

  Further, in the case where the wavelength path by the standby wavelength selective switches 121 and 122 is used as described above, the control unit as a power monitoring function unit in the WSS in any one of the wavelength selective switches 101 to 104 and 111 to 114 When an alarm is output from 100h (step A6), the setting change unit 152 refers to the wavelength path table 151 to check whether a failure at the same wavelength has already occurred (step A7). . In other words, the wavelength of the “provision port” registered in the wavelength path table 151 as described above is checked based on whether or not there is the same wavelength as that of the alarm that has occurred this time.

Here, when the wavelength of the “prospect port” registered in the wavelength path table 151 is not the same as the wavelength applied to the alarm that has occurred this time, a failure at the same wavelength has not already occurred, A wavelength path based on the wavelength applied to the alarm generated this time can be set in the standby wavelength selective switches 121 and 122.
In this case, under the control of the OXC controller 150, a path for the spare optical cross-connect is set in the same manner as in the above-described step A3 to step A5 [from the NO route of step A7 to step A8 to step A10 (Step A8 to Step A10 correspond to Step A3 to Step A5, respectively)].

  However, if the wavelength of the “prospect port” registered in the wavelength path table 151 is the same as the wavelength applied to the alarm that has occurred this time (occurrence of multiple faults), the registered “prospect port” Further, a backup path having the same wavelength as that of "" cannot be set. In this case, the setting change unit 152 does not switch to the path for the spare optical cross-connect, but notifies the failure to a host device (not shown) such as a network management system (YES route in step A7). To Step A11).

  For example, the case shown in FIG. 8 will be described. FIG. 8 shows a wavelength path P1 of wavelength λn−1 through the wavelength selective switches 101 and 114 and a wavelength path of wavelength λn through the wavelength selective switches 121 and 122 between the input port # 11 and the output port # 24. In the case where P2 is set (see the wavelength path table 151 in FIG. 7), a case where multiple failures occur is shown.

  Here, as shown in FIG. 8, wavelength paths of wavelengths λ3, λ4, λn−1, λn set as wavelength paths P3 connecting the input port # 14 and the output port # 21 (wavelengths of FIG. 7). In the path table 151), for example, when a failure occurs in the wavelength path of the wavelength λ3, λ4, or λn-1, a backup path is set for the wavelength path of the wavelength λ3, λ4, or λn-1. Therefore, as shown in FIG. 8, the wavelength selective switches 121 and 122 can set the standby wavelength path P4.

However, when a failure has occurred in the wavelength path of the wavelength λn set as the wavelength path P3, the wavelength selective switches 121 and 122 have already set the path P2 with the wavelength λn as a backup wavelength path. The wavelength path P4 for λn cannot be set.
Therefore, when multiple failures occur in a plurality of wavelength ports as described above, it is possible to switch the route to the standby system regardless of the input / output port setting. Further, by adopting this configuration, even when a failure occurs in one wavelength of the operation wavelength in the wavelength selective switches 101 to 104 and 111 to 114, only the path (wavelength path) can be switched to the standby system. The failure does not affect the wavelength path of other wavelengths.

  Further, for example, as in the optical cross-connect device 1A shown in FIG. 9, by having a plurality of systems (two systems in this case) of the standby wavelength selective switches 121 to 124, the above-described multiple failures for the same wavelength can be avoided. It becomes possible to do. In this case, the number of branches of the WDM signal light in the optical couplers 131 to 134 and the number of multiplexed WDM signal lights in the optical couplers 141 to 144 are appropriately increased according to the number of systems of the standby wavelength selective switches. .

[A1-22] Replacement operation of the wavelength selective switch as the current operation in which an abnormality has occurred Next, when the wavelength path is switched by the standby wavelength selective switches 121 and 122 as described above, an abnormality such as a failure causing the abnormality A procedure for exchanging the wavelength selective switch in which the error occurs will be described.
In the following, a procedure for performing in-service replacement of the upstream side active wavelength selective switches 101 to 104 will be described. However, in the case where replacement work is performed on the downstream side active wavelength selective switches 111 to 114. This can also be performed following the exchange of the wavelength selective switch 101 on the upstream side below.

[A1-221] Wavelength selective switch replacement operation when a backup path is set due to a single wavelength path failure For example, when a backup wavelength path as shown in FIG. 6 is set, Therefore, it is necessary to replace the wavelength selective switch 101 that caused the switching to the standby wavelength path. As a specific example, replacement work of the wavelength selective switch 101 in the case shown in FIG. 6 will be described according to (1) to (11).

  First, (1) wavelength-port information passing through the wavelength selective switch 101 in which a failure has occurred is obtained from the wavelength path table 151 (see FIG. 7) of the OXC controller 150, and (2) a spare input side of the passing wavelength. The switch of the wavelength selective switch 121 is turned on. In this case, the wavelengths passing through the wavelength selective switch 101 are wavelengths λ1 to λ4 and λn-1. Therefore, the wavelength selection switch 121 turns on the switch so that the wavelengths λ1 to λ4 and λn−1 from the optical coupler 131 are selected to the output path.

  (3) Next, the service of the wavelength selective switch 101 in which the failure has occurred is stopped and put into a removable state. (4) Then, the wavelength selective switch 122 on the auxiliary output side is turned on. At this stage, the path in the optical cross-connect device 1 is switched. That is, switch switching is turned on so that optical signals having wavelengths λ1 to λ4 and λn−1 from the wavelength selective switch 121 are output to the optical coupler 141.

  (5) Then, in the downstream wavelength selection switches 111 to 114, the switching of the port from the wavelength selection switch 101 in which the failure has occurred is turned off. In this case, switching of the wavelength path by the wavelengths λ1 and λ2 in the wavelength selective switch 111, the wavelength path by the wavelengths λ3 and λ4 in the wavelength selective switch 112, and the wavelength path by the wavelength λn−1 in the wavelength selective switch 114 is turned off. .

(6) Further, when the above-mentioned backup wavelength path is set, the backup wavelength selective switches 121 and 122 notify the OXC controller 150 of setting information regarding the wavelength path related to the connection, and the OXC controller. In 150, the connection information managed by the wavelength path table 151 is updated.
(7) Then, after replacing the wavelength selective switch 101 in which the failure has occurred, the replaced wavelength selective switch 101 is operated again. At this time, (7) the OXC controller 150 acquires the latest wavelength path setting information in the wavelength path table 151. (8) Then, by turning on the port switching setting of the working wavelength selective switches 111 to 114 on the downstream side based on the acquired wavelength path setting information, the optical signal from the wavelength selective switch 101 after the replacement work is changed. Turn on the switching path to be guided.

(9) Further, after the selection of the standby wavelength selective switch 121 is turned off, (10) the path switching according to the wavelength path table 151 in the wavelength selective switch 101 after the replacement work is turned on, thereby changing the wavelength. Path recovery is performed. (11) Thereafter, the selection of the standby wavelength selective switch 122 on the output port side is turned off to return to the initial state.
[A1-222] Wavelength selective switch replacement operation when multiple failures occur Further, the wavelength selective switch replacement when multiple failures occur as shown in FIG. 8, for example, is performed as follows.

  That is, when the OXC controller 150 performs switching to the standby wavelength selective switch 121 of all the normal operation channels in the wavelength selective switch 101 in which the failure has occurred, first, referring to the wavelength path table 151, the failure has occurred. The correspondence information between the operating wavelength of the wavelength selective switches 101 and 104 and the output port to which the wavelength selective switch 101 or 104 is connected is obtained, and the upper layer of the wavelength path in which multiple failures occur [for example, SONET (Synchronous Optical Network) Check for protection in Protocol Label Switching.

  In other words, among the paths that cause multiple failures, if protection is possible in the upper layer, the route is switched by the protection in the upper layer, and there is no protection in the upper layer (if there are multiple, In the same manner as described above, detouring to the path for the standby optical cross-connect is performed, and the wavelength selective switch in which the failure has occurred is replaced.

  That is, the wavelengths λ1 to λ4 and λn−1 that are switched by the wavelength selective switch for which the failure occurs without protection in the upper layer (for example, the wavelength selective switch 101) are set as the standby wavelengths on the input port side. The port is switched to the selection switch 121 and detoured for replacement. Thereafter, the operation of the selection switch 101 in which the failure has occurred is stopped. Then, the standby wavelength selection switch 122 on the output port side is switched, and the wavelength path switching using the backup path is completed.

  Thereafter, in order to prevent malfunction, the output-side active wavelength selective switches 111 to 114 turn off the switching of the ports from the failed wavelength selective switch 101 and replace the failed wavelength selective switch 101. After the replacement, the path information of the wavelength path passing through the spare wavelength selective switches 121 and 122 is obtained, and the path from the wavelength selective switch 101 after the replacement work is conducted through the output side active wavelength selective switches 111 to 114. Switch on the port so that.

Thereafter, switching to the redundant path of the standby wavelength selective switch 101 on the input port side is canceled, and the wavelength path setting in the wavelength selective switch 101 after the replacement work is turned on, so that the switched wavelength selective switch 101 passes. Wavelength path to be restored. Finally, the standby wavelength selective switch 122 on the output port side is turned off to return to the initial state.
[A1-3] Contrast with the case where spare wavelength selective switches are individually provided for the current wavelength selective switches 101-104, 111-114 As described above, the optical cross-connect device 1 according to the first embodiment. According to the optical signal of the wavelength selected in each output route in the upstream wavelength selective switches 101 to 104, and the optical signal of the wavelength selected in the output route in the downstream wavelength selective switches 111 to 114 As the shared standby system, there are provided the standby wavelength selective switches 121 and 122 that can set the path for the optical cross-connect. Therefore, when the wavelength selective switch is replaced, the other operating normally In addition to eliminating the impact on connections and effectively using spare wavelength path resources, in-service failure recovery (during device operation) is performed. There are also advantages that can be met.

Further, when compared with the optical cross-connect device 10 having the standby system as shown in FIG. 10, as shown below, by suppressing the increase in the number of wavelength selective switches provided as the standby system, There is also an advantage that the operating rate of the wavelength selective switch in the operating state can be improved, the apparatus can be downsized, and the power consumption can be reduced.
Here, the optical cross-connect device 10 shown in FIG. 10 includes wavelength selective switches 11 to 14 and 21 to 24 corresponding to the wavelength selective switches 101 to 104 and 111 to 114 in FIG. Spare wavelength selective switches 31 to 34 and 41 to 44 for the switches 11 to 14 and 21 to 24 are individually provided.

  In FIG. 10, the optical couplers 51 to 54 respectively divide the light from the input ports # 11 to # 14 into two branches, one for the upstream wavelength selective switches 11 to 14, and the other for the spare. Are output to the wavelength selective switches 31-34. The optical couplers 61 to 64 respectively combine the output optical signals from the downstream wavelength selective switches 21 to 24 and the output optical signals from the standby wavelength selective switches 41 to 44. Thus, the output is made to the corresponding output ports # 21 to # 24.

As a result, the optical cross-connect device 10 always maintains two systems as spare wavelength selective switches 31 to 34 and 41 to 44 having functions equivalent to those of the wavelength selective switches 11 to 14 and 21 to 24 that are currently used. 1 + 1 redundant configuration is provided.
In the optical cross-connect device 10 as shown in FIG. 10, since it is necessary to always keep a standby system that is not used during normal operation in an operational state, the device is increased in size and power consumption is increased. .

On the other hand, according to the optical cross-connect device 1 according to the first embodiment, the number of wavelength selective switches provided as a standby system can be greatly reduced as compared with the case of FIG. The operating rate of the selection switch can be improved, the device can be downsized and the power consumption can be reduced.
Further, according to the optical cross-connect device 1 according to the first embodiment, it is possible to suppress loss such as branching loss as compared with the cases of the second and third modified examples described later, and also the isolation characteristics ( The blocking property) can be kept good.

[A2] Description of First Modification of First Embodiment In the first embodiment described above, the four-input four-output (4 × 4) optical cross-connect device 1 has been described in detail. However, the present invention may be applied to an N × M optical cross-connect device having other input port numbers (N) and output port numbers (M).

  For example, by using a 1 × 8 wavelength selective switch 160A as shown in FIG. 11A on the upstream side and an 8 × 1 wavelength selective switch 160B as shown in FIG. Even in the case of configuring eight optical cross-connect devices, according to the first embodiment, the optical signal of the wavelength selected in each output route in the upstream wavelength selective switch and the output in the downstream wavelength selective switch If a standby wavelength selection switch that can set the path for the optical cross-connect is provided on the input port side and the output port side as a shared standby system for the optical signal of the wavelength selected for the path Good.

[A3] Description of Second Modification of First Embodiment FIG. 12 is a diagram showing an optical cross-connect device 1B according to a second modification of the first embodiment of the present invention. The optical cross-connect device 1B shown in FIG. 12 differs from the case of the first embodiment described above in that the input wavelength multiplexed optical signals from the input ports # 11 to # 14 are output to the number of output ports # 21 to # 24 (4). 1 × 4 optical couplers 101B to 104B branching corresponding to are provided as upstream optical elements. In FIG. 12, the same reference numerals as those in FIG. 1 denote almost the same parts.

That is, in the wavelength selective switches 111 to 114 on the downstream side, WDM light from all the input ports # 11 to # 14 is input through the optical couplers 101B to 104B and should be guided to the corresponding output ports # 21 to # 24. An optical cross-connect function is realized by selectively outputting an optical signal having a wavelength from the input port.
The standby wavelength selective switches 121 and 122 are, as in the case of the first embodiment described above, a shared standby system for optical signals having wavelengths selected by the downstream wavelength selective switches 111 to 114 as output paths. As a result, it is possible to set a route for the optical cross-connect.

Also in the optical cross-connect device 1B configured in this way, the same advantages as in the case of the first embodiment described above can be obtained by the standby wavelength selective switches 121 and 122.
[A4] Description of Third Modification of First Embodiment FIG. 13 is a diagram showing an optical cross-connect device 1C according to a third modification of the first embodiment of the present invention. Unlike the case of the first embodiment, the optical cross-connect device 1C shown in FIG. 13 combines the output optical signals from the upstream wavelength selective switches 101 to 104 and guides them to the output ports # 21 to # 24. A plurality of 4 × 1 optical couplers 111C to 114C as downstream optical elements are provided in accordance with the number of output ports.

  That is, in the upstream wavelength selective switches 101 to 104, the optical signal output path is switched so that the wavelength components to be guided to the output ports # 11 to # 14 are output to the corresponding optical couplers 111C to 114C, and the optical signals are switched. In the couplers 111C to 114C, optical signals from the wavelength selective switches 101 to 104 are combined and guided to the output ports # 21 to # 24, thereby realizing an optical cross-connect function.

Then, the standby wavelength selective switches 121 and 122 provide a path for the optical cross-connect as a shared standby system for the optical signal of the wavelength selected in each output path in the upstream side wavelength selective switches 101 to 104. It can be set.
Also in the optical cross-connect device 1C configured in this manner, the same advantages as in the case of the first embodiment can be obtained by the standby wavelength selective switches 121 and 122.

[A5] Description of Fourth Modification of First Embodiment The optical cross-connect device 1 according to the first embodiment described above includes, for example, a plurality of OADM (Optical Add Drop Multiplexer) devices 200 as shown in FIG. In addition, it can be realized by providing the wavelength selective switches 121 and 122.
That is, in the OADM device 200, the wavelength selective switch 201 for dropping one branched light from the branch coupler 231 and the branch coupler 231 and the add for adding an optical signal to the other branched light from the branch coupler 231 are provided. The wavelength selective switch 211 and the multiplexing coupler 241 are provided. The branching coupler 231 and the multiplexing coupler 241 are provided with redundant ports 231a and 241a, respectively.

  As shown in FIG. 14B, a plurality of (for example, n) OADM devices 200 having such a configuration are provided, and a spare port 231a of the branch couplers 231 to 23n constituting each OADM device 200 is provided as a spare. The wavelength selective switch 121 is connected, and the output of the wavelength selective switch 122 connected in series to the wavelength selective switch 121 is connected to the multiplexing couplers 241 to 24n forming each OADM device 200 through the redundancy port 241a. .

  Then, the drop wavelength selective switches 201 to 20n and the add wavelength selective switches 211 to 21n forming each OADM device 200 are connected in the same manner as the wavelength selective switches 101 to 104 and 111 to 114 in the first embodiment. By doing so, it is possible to upgrade to a hub node, and it is possible to provide a common redundant configuration similar to that in the first embodiment by using the wavelength selective switches 121 and 122 for backup.

[B] Description of Second Embodiment FIG. 15 is a diagram showing an optical cross-connect device 300 according to a second embodiment of the present invention. The optical cross-connect device 300 shown in FIG. 15 includes wavelength selective switches 101 to 104 and 111 to 114 and optical couplers 131 to 134 and 141 to 144 similar to those in the first embodiment described above. The configuration for setting the path of the optical cross-connect is different from that in the first embodiment.

  That is, in the optical cross-connect device 300 according to the second embodiment, the tunable filters 301-1 to 301-4, the optical couplers 302-1 to 302-4 as branching elements, and the conduction cutoff gates 303-1 to 303- 4 are individually provided for setting a path of a spare optical cross-connect for optical signals from the input ports # 11 to # 14. In FIG. 15, only the corresponding configurations for input ports # 11 and # 12 and output ports # 21 and # 22 are shown.

  Here, the wavelength tunable filter 301-1 is for setting a path of an optical cross-connect for spare optical signals from the input port # 11. Specifically, a WDM optical signal from the input port # 11 can be input and transmitted through the selected wavelength component, and is set from the input port # 11 through the wavelength selective switches 101, 111 to 114, in particular. When an abnormality such as a failure occurs in the wavelength path to be transmitted, the wavelength component related to the failure can be transmitted.

The optical coupler 302-1 branches an optical signal having a wavelength component transmitted through the wavelength tunable filter 301-1 to each output port, and the conduction cutoff gate 303-1 is a branching element 302-1. The branched optical signal is subjected to gate processing (conduction or cutoff processing) to the output ports # 21 to # 24.
For example, when a wavelength path leading to the output ports # 21 and # 22 is set for the optical signal having the failed wavelength among the WDM optical signals from the input port # 11, these output ports # 21 are used. , # 22 is guided only to branched light, and branched light to other output ports # 23, # 24 is blocked.

  Further, the OXC controller 350 includes a wavelength path table 351 and a setting change unit 352, as in the case of the first embodiment described above. When the setting change unit 352 receives an alarm from any of the wavelength selective switches 101 to 104 and 111 to 114 indicating an abnormality such as a failure in the wavelength channel component in use, the wavelength path table 351 is updated. Referring to FIG. 6, the wavelength variable filters 301-1 to 301-4 and the conduction cutoff gates 303-1 to 303-4 in the input ports # 11 to # 14 related to the wavelength path for the failure occurrence wavelength are controlled to generate the failure. The wavelength path set for the wavelength can be restored.

  The optical couplers 304-1 to 304-4 are provided corresponding to the output ports # 21 to # 24, and the conduction cutoff gates corresponding to the branched lights from the optical couplers 302-1 to 302-4 as branching elements. The optical signals are input via 303-1 to 303-4, and are multiplexed with respect to these branched lights and output to corresponding output ports # 21 to # 24 through optical couplers 141 to 144.

In addition, the configuration for setting a spare route provided for each of the input ports # 11 to # 14 (reference numerals 301-1 to 301-4, 302-1 to 302-4 and 303-1 to 303-4). Can be configured in a multiplexed configuration for each of the input ports # 11 to # 14 by interposing a branching optical coupler 306 downstream of the optical couplers 131 to 134.
In this way, the number of wavelengths that can be recovered through the wavelength tunable filters 301-1 to 301-4 can be increased according to the number of multiplexing (for example, if two layers are duplicated, two types of wavelengths can be recovered from the failure. Can respond to multiple failures.

  With the above-described configuration, the optical cross-connect device 300 according to the second embodiment of the present invention can perform the optical cross-connect process similarly to the case of the first embodiment, and the wavelength selective switches 101 to 104, When a failure occurs in the wavelength path set by 111 to 114, the wavelength path related to the failure occurrence wavelength is restored by the wavelength variable filters 301-1 to 301-4 and the conduction cutoff gates 303-1 to 303-4. Can be made.

  During normal operation, the wavelength tunable filters 301-1 to 301-4 do not operate and do not transmit optical signals, but are switched by the wavelength selective switches 101 to 104 and 111 to 114 that are in operation. When a failure is detected by an internal monitoring mechanism (see reference numeral 100h in FIG. 2), the OXC controller 350, like the first embodiment, sets the switching output destination or switching input source so as to suppress the influence of the failure. The switching wavelengths in the wavelength selective switches 101 to 104 and 111 to 114 are turned off.

Next, wavelength switching in the backup path is performed by wavelength selection by the wavelength tunable filters 301-1 to 301-4. Specifically, when the wavelength path of the wavelengths λ1 and λ2 is set from the input port # 11 to the output port # 22, a failure occurs in the wavelength path for the wavelength λ2 (see A in FIG. 16). This will be described as an example.
When a failure occurs in the wavelength path of the wavelength λ2, the wavelength selective switch 101 detects this and outputs an alarm notifying the occurrence of the failure of the wavelength λ2 to the OXC controller 350. In the OXC controller 350, the wavelength tunable filter 301-1 is controlled so as to transmit the optical signal having the wavelength λ2 through the wavelength tunable filter 301-1, and the conduction cutoff gate 303-1 is controlled to thereby output the output port # 1. An optical signal with respect to the wavelength λ 2 is output to the optical coupler 304-2 that leads to the line 22. On the other hand, for the other output ports # 21, # 23, and # 24, the optical signal for wavelength λ2 is blocked by conduction cut-off gate 303-1.

As a result, the wavelength path for the wavelength λ2 where the failure has occurred can be recovered through the optical coupler 306, the wavelength tunable filter 301-1, the optical coupler 302-1, the conduction cutoff gate 303-1 and the optical coupler 304-2. (See B1 in FIG. 17).
The restoration of the wavelength path does not affect the communication by other wavelength paths. That is, as a wavelength path connected between the input port # 11 and the output port # 22, the wavelength path for the wavelength λ1 where no failure has occurred can be set as it is through the wavelength selective switches 101 and 112. (See B2 in FIG. 17).

  In the optical cross-connect device 300 according to the second embodiment, when the wavelength selective switches 101 to 104 and 111 to 114 in which a failure has occurred are replaced, the wavelength selective switches 101 to 104 and 111 in which the failure has occurred once. The service for all wavelengths passing through .about.114 is stopped, or the work is exchanged after detouring to a route that is redundant in the upper protocol.

  As described above, according to the optical cross-connect device 300 according to the second embodiment of the present invention, the wavelength tunable filters 301-1 to 301-4, the branch couplers 302-1 to 302-4, and the conduction cutoff gates 303-1 to 303-1. 303-4 is provided, so that a simplified redundant configuration can be realized as compared with the configuration shown in FIG. 10 described above, the number of wavelength selective switches provided as a standby system can be greatly reduced, and the size of the device can be reduced. There is also an advantage that power consumption can be reduced.

In addition, there is an advantage that when the wavelength selective switch is replaced, there is no influence on other normally operating connections, and the spare wavelength path resource can be effectively used.
In the above-described second embodiment, the four-input four-output (4 × 4) optical cross-connect device 1 has been described in detail. However, according to the present invention, the present invention is not limited to this. N) and the number of output ports (M) may be applied to an N × M optical cross-connect device. In this case, a set of the above-described wavelength tunable filter, branch coupler, and conduction cutoff gate is appropriately provided according to the input port, and the number of branches in the branch coupler is appropriately changed according to the number of output ports.

[C] Others Regardless of the above-described embodiments, various modifications can be made without departing from the spirit of the present invention.
In addition, the device of the present invention can be manufactured based on the disclosure of the above-described embodiment.
[D] Appendix (Appendix 1)
Multiple input ports,
Multiple output ports,
A plurality of upstream optical elements provided corresponding to the plurality of input ports;
A plurality of downstream optical elements provided corresponding to the plurality of output ports,
Each of the plurality of upstream optical elements has an input connected to the corresponding input port and a plurality of outputs connected to the plurality of downstream optical elements,
Each of the plurality of downstream optical elements is connected to the output port corresponding to the output of the outputs of the plurality of upstream optical elements as inputs,
For the light from the plurality of input ports, the plurality of upstream optical elements and the plurality of downstream optical elements are configured so that the plurality of output ports serving as output destinations can be switched for each wavelength,
And an upstream side standby switch, wherein a plurality of inputs are connected to each of the plurality of input ports, and the output of light from the plurality of inputs can be switched for each wavelength;
A downstream spare switch having an input connected to the output of the upstream spare switch, a plurality of outputs connected to each of the plurality of output ports, and capable of outputting light from the input to the plurality of outputs for each wavelength When,
An optical device comprising:

(Appendix 2)
The optical device according to attachment 1, wherein
Each of the plurality of upstream optical elements is configured as an upstream optical switch capable of outputting light from an input to the plurality of outputs for each wavelength.
(Appendix 3)
The optical device according to attachment 1, wherein
Each of the plurality of downstream optical elements is configured as a downstream optical switch capable of selectively outputting light from the plurality of upstream optical elements for each wavelength.

(Appendix 4)
The optical device according to attachment 1, wherein
When a failure occurs in the connection of the first upstream optical element, which is one of the upstream optical elements, to the first downstream optical element, which is one of the downstream optical elements,
The upstream spare switch receives light having a wavelength that is input from an input port corresponding to the first upstream optical element and is output from the first upstream optical element to the first downstream optical element. Output,
The downstream auxiliary switch outputs the input light to an output port corresponding to the first downstream optical element.

(Appendix 5)
The optical device according to attachment 1, wherein
When a failure occurs in the output of the first wavelength of the first upstream optical element, which is one of the upstream optical elements,
The upstream standby switch outputs light of the first wavelength input from an input port corresponding to the first upstream optical element,
The downstream standby switch outputs the input light to an output port corresponding to the downstream optical element from which the first wavelength is output from the first upstream optical element. apparatus.

(Appendix 6)
The optical device according to attachment 1, wherein
With N and M being a plurality of integers, the upstream optical element is configured by 1 × N wavelength selective switches and M are provided, and the downstream optical element is configured by M × 1 wavelength selective switches. The optical device according to appendix 1, wherein N are provided.

(Appendix 7)
An optical device according to appendix 1 or 2,
With N and M as a plurality of integers, the upstream optical element is configured by a 1 × N wavelength selective switch and M is provided, and the downstream optical element is configured by an M × 1 optical coupler. An optical device characterized in that N are provided.

(Appendix 8)
An optical device according to appendix 1 or 3, wherein
With N and M as a plurality of integers, the upstream optical element is configured by a 1 × N wavelength selective switch and M is provided, and the downstream optical element is configured by an M × 1 optical coupler. An optical device characterized in that N are provided.

(Appendix 9)
The optical device according to any one of appendices 1 to 8,
An input port-side optical coupler that splits the wavelength multiplexed optical signal input from the input port into two and outputs one to the upstream optical element corresponding to the input port and the other to the upstream spare switch Depending on the number of ports, there are multiple,
An output wavelength-multiplexed optical signal output from the downstream side optical devices, said downstream output port side optical couplers and an optical signal combiner and outputted from the pre-switch is provided with a plurality according to the output ports An optical device.

(Appendix 10)
The optical device according to any one of appendices 1 to 9,
A path set by the upstream optical element and the downstream optical element between the input port and the output port for each optical wavelength, and a path set by the upstream spare switch and the downstream spare switch; An optical device comprising a control unit that performs switching control between the two.

(Appendix 11)
The optical device according to appendix 10, wherein
The control unit
A wavelength path table for storing the relationship between the input port and the output port for which a wavelength path is to be set for each wavelength forming the wavelength multiplexed optical signal;
A setting changing unit for changing the switching setting of the upstream optical element, the downstream optical element, the upstream spare switch, and the downstream spare switch based on the contents of the wavelength path table;
An optical device characterized by comprising:

(Appendix 12)
An optical device according to appendix 11,
The setting changing unit sets the path set by the upstream spare switch and the downstream spare switch for the other wavelength paths between the upstream optical element and the downstream optical element forming the wavelength path where the abnormality has occurred. An optical device that is configured to be deferred without being switched to.

(Appendix 13)
An optical cross-connect device that performs optical cross-connect between a plurality of input ports and a plurality of output ports,
An upstream wavelength selective switch for outputting an input wavelength multiplexed optical signal from the input port from an output path switched for each wavelength is provided corresponding to the input port, and an output path of each upstream wavelength selective switch A downstream wavelength selection optical switch that selects an optical signal to be guided to the output port as an input and outputs an output wavelength multiplexed optical signal is provided corresponding to the output port.
A wavelength tunable filter that receives an input wavelength multiplexed optical signal from the input port and transmits the selected wavelength component, and an optical signal of the wavelength component transmitted by the wavelength tunable filter is addressed to each output port. An optical cross comprising: a branch element for branching; and a conduction cutoff gate for conducting or blocking the optical signal branched by the branch element to or from each output port, depending on the number of the input ports. Connect device.

It is a figure which shows the optical cross-connect apparatus concerning 1st Embodiment of this invention. It is a figure which shows a wavelength selective switch. It is a figure which shows the wavelength path table in 1st Embodiment. It is a flowchart for demonstrating operation | movement of 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement of 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement of 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement of 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement of 1st Embodiment of this invention. It is a figure which shows the modification of 1st Embodiment of this invention. It is a figure which shows the comparative example for demonstrating the effect of 1st Embodiment of this invention. (A), (b) is a figure for demonstrating the 1st modification of 1st Embodiment of this invention. It is a figure which shows the 2nd modification of 1st Embodiment of this invention. It is a figure which shows the 3rd modification of 1st Embodiment of this invention. (A), (b) is a figure for demonstrating the 4th modification of 1st Embodiment of this invention. It is a figure which shows the optical cross-connect apparatus concerning 2nd Embodiment of this invention. It is a figure for demonstrating operation | movement of 2nd Embodiment of this invention. It is a figure for demonstrating operation | movement of 2nd Embodiment of this invention. It is a figure which shows a prior art. It is a figure which shows a prior art. It is a figure for demonstrating the subject of a prior art.

Explanation of symbols

1, 1A to 1C, 10, 300, 910 Optical cross-connect device 100a Demultiplexing unit 100b Switch unit 100c Multiplexing unit 100d Tap coupler 100e Optical switch 100f Demultiplexing unit 100g Photo detector 100h Control unit 101-104 Upstream wavelength selection switch 101B ~ 104B Branch coupler (branch part)
111-114 Downstream-side wavelength selective switch 111C-114C multiplexing coupler (multiplexing unit)
121, 122 Preliminary wavelength selective switch 131-134, 141-144 Optical coupler 150, 350 OXC controller 151, 351 Wavelength path table 152, 352 Setting changer 160A, 160B Wavelength selective switch 200 OADM device 201-20n, 211- 21n Wavelength selection switch 231 to 23n Branch coupler 241 to 24n Multiplex coupler 301-1 to 301-4 Variable wavelength filter 302-1 to 302-4 Branch coupler (branch element)
303-1 to 303-4 conduction cutoff gates 304-1 to 304-4,306 optical coupler 901 wavelength demultiplexer 902 optical switch 903 optical variable attenuator 904 wavelength multiplexer 911 to 91n, 921 to 92n wavelength selective switch

Claims (5)

  1. Multiple input ports,
    Multiple output ports,
    A plurality of upstream optical elements provided corresponding to the plurality of input ports;
    A plurality of downstream optical elements provided corresponding to the plurality of output ports,
    Each of the plurality of upstream optical elements has an input connected to the corresponding input port and a plurality of outputs connected to the plurality of downstream optical elements,
    Each of the plurality of downstream optical elements is connected to the output port corresponding to the output of the outputs of the plurality of upstream optical elements as inputs,
    For the wavelength multiplexed optical signals from the plurality of input ports, the plurality of upstream optical elements and the plurality of downstream optical elements are configured such that the plurality of output ports serving as output destinations can be switched for each wavelength,
    And an upstream side standby switch in which a plurality of inputs are connected to each of the plurality of input ports, and the output of the wavelength multiplexed optical signal from the plurality of inputs can be switched for each wavelength;
    A downstream spare that has an input connected to the output of the upstream spare switch, a plurality of outputs connected to each of the plurality of output ports, and is capable of outputting an optical signal from the input to the plurality of outputs for each wavelength. A switch,
    An input port-side optical coupler that splits the wavelength multiplexed optical signal input from the input port into two and outputs one to the upstream optical element corresponding to the input port and the other to the upstream spare switch Depending on the number of ports, there are multiple,
    A plurality of output port side optical couplers for combining and outputting the output wavelength multiplexed optical signal output from the downstream optical element and the optical signal from the downstream standby switch are provided according to the number of output ports. An optical device.
  2. The optical device according to claim 1,
    When a failure occurs in the connection of the first upstream optical element, which is one of the upstream optical elements, to the first downstream optical element, which is one of the downstream optical elements,
    The upstream spare switch is an optical signal having a wavelength output from the first upstream optical element to the first downstream optical element, which is input from an input port corresponding to the first upstream optical element. Output
    The downstream auxiliary switch outputs an input optical signal to an output port corresponding to the first downstream optical element.
  3. The optical device according to claim 1,
    When a failure occurs in the output of the first wavelength of the first upstream optical element, which is one of the upstream optical elements,
    The upstream standby switch outputs an optical signal of the first wavelength input from an input port corresponding to the first upstream optical element,
    The downstream standby switch outputs the input optical signal to an output port corresponding to the downstream optical element in which the first wavelength is output from the first upstream optical element. Optical device.
  4. The optical device according to any one of claims 1 to 3,
    A path set by the upstream optical element and the downstream optical element between the input port and the output port for each optical wavelength, and a path set by the upstream spare switch and the downstream spare switch; An optical device comprising a control unit that performs switching control between the two.
  5. An optical cross-connect device that performs optical cross-connect between a plurality of input ports and a plurality of output ports,
    An upstream wavelength selective switch for outputting an input wavelength multiplexed optical signal from the input port from an output path switched for each wavelength is provided corresponding to the input port, and an output path of each upstream wavelength selective switch A downstream wavelength selection optical switch that selects an optical signal to be guided to the output port as an input and outputs an output wavelength multiplexed optical signal is provided corresponding to the output port.
    A wavelength tunable filter that receives an input wavelength multiplexed optical signal from the input port and transmits the selected wavelength component, and an optical signal of the wavelength component transmitted by the wavelength tunable filter is addressed to each output port. An optical cross comprising: a branch element for branching; and a conduction cutoff gate for conducting or blocking the optical signal branched by the branch element to or from each output port, depending on the number of the input ports. Connect device.
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